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(11) | EP 0 610 596 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Door control device |
(57) A door closing device comprises a piston (12) having at one end a seal (21) which
seals the interface between the piston and a housing (10). The seal (21) also acts
as a one-way valve and carries a pressure relief valve (37). |